R Notebook

library(datasets)
library(Hmisc)

Attaching package: ‘Hmisc’

The following object is masked from ‘package:e1071’:

    impute

The following objects are masked from ‘package:base’:

    format.pval, units

library(grid)
library(ggplot2)
library(moments)

Attaching package: ‘moments’

The following objects are masked from ‘package:e1071’:

    kurtosis, moment, skewness

library(e1071)

df <- read.csv('stock_details_5_years.csv')

df_googl <- df[df$Company == "GOOGL", ]
df_googl

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NA

ts.plot(df_googl$Open, xlab="Time", ylab = 'Googl Opening Prices')

diff_open <- diff(df_googl$Open, lag = 1, differences = 1)

mean_diff <- mean(diff_open, na.rm = TRUE)

plot(density(diff_open, na.rm = TRUE), main = "Density of First Differences in Open Price", 
     xlab = "First Differences", ylab = "Density")

abline(v = mean_diff, col = "red", lwd = 2, lty = 2)

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NA

# Compute first differences
diff_open <- diff(df_googl$Open, lag = 1, differences = 1)

# Calculate statistics
mean_diff <- mean(diff_open, na.rm = TRUE)
sd_diff <- sd(diff_open, na.rm = TRUE)
min_diff <- min(diff_open, na.rm = TRUE)
max_diff <- max(diff_open, na.rm = TRUE)
skewness_diff <- skewness(diff_open, na.rm = TRUE)
kurtosis_diff <- kurtosis(diff_open, na.rm = TRUE)
quantiles_diff <- quantile(diff_open, probs = c(0.25, 0.5, 0.75), na.rm = TRUE)

# Print results
list(
  Mean = mean_diff,
  Std_Dev = sd_diff,
  Min = min_diff,
  Max = max_diff,
  Skewness = skewness_diff,
  Kurtosis = kurtosis_diff,
  Quantiles = quantiles_diff
)

$Mean
[1] 0.06634328

$Std_Dev
[1] 1.916098

$Min
[1] -9.669998

$Max
[1] 13.6555

$Skewness
[1] 0.1237204

$Kurtosis
[1] 4.495004

$Quantiles
       25%        50%        75% 
-0.8550034  0.1090012  1.0299988 

Around day 800 something happens, after which the data is more spread out than in the beginning.

library(lubridate)

df_googl$Date2 <- ymd_hms(df_googl$Date)  # Convert to POSIXct

ggplot(data=df_googl,aes(x=Date2,y=Open))+
  geom_segment(aes(xend=Date2,yend=Open+Open_diff),arrow=arrow(length=unit(.2,"cm")))+
  stat_density2d(aes(colour=..level..))+
    labs(
    title = "GOOGL Opening Stock - 2D Vector Density Plot",
    x = "Date",
    y = "Opening Price",
    colour = "Density Level"
  )

## TEST DATA

Open_diff2 <- append(Open_diff, 0)
length(Open_diff2)

[1] 1258

openLM <- lm(Open_diff2~Open, data=df_googl)
summary(openLM)

Call:
lm(formula = Open_diff2 ~ Open, data = df_googl)

Residuals:
    Min      1Q  Median      3Q     Max 
-9.6491 -0.9218  0.0243  0.9474 13.6759 

Coefficients:
             Estimate Std. Error t value Pr(>|t|)
(Intercept)  0.271651   0.183060   1.484    0.138
Open        -0.002123   0.001808  -1.174    0.241

Residual standard error: 1.915 on 1256 degrees of freedom
Multiple R-squared:  0.001096,  Adjusted R-squared:  0.0003009 
F-statistic: 1.378 on 1 and 1256 DF,  p-value: 0.2406